Gearing.



G. F. DEADY & G. H. HOLLAND.

GEARING.

APPucATxoN msn SEPT. 22, 1913.

l ,144,32. Patented June 22, 1915.

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-speoicaton of Letters Patent.

Patented June 223-. 1915.

sippldetion filed September 22, 1913. Serial Nof?.

` ence marked thereon, which form a' part of this speciiication.

This invention relates to new and useful 'improvements in gearing whichis applicable to a 'variety of machines to be driven and especially forautomobiles.

The object of the invention is to provide a type Vof gearing throughwhich force may be greatly multiplied and a reversed direction ofrotation easily obtained.

The force multiplying means comprises a plate which .may be attanhed toa fly wheel or an integral part thereof. rlhis plate is provided withmultiple couvolute or gear threads on a face thereof the convolutions ofwhich lie parallel, Vlith these threads a pinion is geared which isshiftable to Opf posite sides oi the axis oi. the multiple threaded gearto change the direction of rotation of the driven member. The forcetransmitted to the driven member ismultiplied in an inverse ratio to thereduction of the speed. The pinion is sliiftable across the face of themultiple threaded gear. This may be done by any suitable shifting meansof which two forms are shown in the drawing.;d

in the accompanying;l ldrawinggs,y Figure 1 is a front elevation of ourimproved gearing; Fig. i2 is a sectional view on the line z-a o' Fig. 1;Fig.; 3 is a detail view of the means for shifting the pinion to obtaina reverse motion of the driven member; and Fig. el is a modified meansfor obtaining a reverse motion of the driven member.

ln a detail description of the invention, similar reference charactersindicate correspending parte of the structure.

1 designates a driving' shaft mounted in a bearing 2 and having; Xedthereto a ily wheel 3. This fly wheel may be provided `rarrangred uponal ofthe ily wheel.

to the accompanying drawwith dou-ble -convolute threads 4 arranged onagisce, thereof and extending from near the axis thereof to theperiphery as shown in Fig. l. These convolute threads 4 may b e plate 5secured to the face 6 designates a spur pinion arranged to mesh withsaid convolute threads to be driven therefrom. It will be understoodthat a variation in the amount of force eX- erted upon the driven memberis due to a variation between the number of teeth on the respectivegears @e and 6. The pinion 6 has a facial bevel gear i' united theretoboth of which are mounted upon a shaft 8 which in turn is journaled insliding blocks 10. Said sliding blocks 10 fit in grooves 11 in theopposite side of a rectangular frame 12 which is suspended from thebea-ring .i

2. -The said gears 6 and 7 may, therefore, be shifted in said frame toone or the other side 'of the axis of the convolute threaded gear el toreverse the direction of rotation of the gears 6 and 7 The bevel gear'l' is in mesh with a similar gear 13 which i fixed to a powertransmission shaft 14:. This shaft le may extend to the rear axle of anautomobile to transmit the power theretok through a well knowndifferential gear (not shown). Any suitable means may be pro vided forshifting the driven gear 6 to reverse the direct'on of movement of thedriven shaft. In Fig. 3 an arm 15 is shown of which one is dconnected toeach oi' the sliding blocks 10 Lnd extended upwardly to a point wheretley are brought in contact with the lower arxn of a bell crank lever16, the upper' arm of which may be connected to any suitable means foroperating said lever to shift the cross head 9 and therewith the gear 6.By the use of this shifting means the pinion 6 remains in mesh with theconvolute threads of the driving gear during the shifting movement. InFig. 4, another means is shown for shifting the driven pinion 6 toreverse the direc- In operating the' lever 2o 'che pinion e is' movedoutwardly and upwardly 1n an arc of a circle from engagement with the tthreads on the driving gear 4 and is shifted Having described ourmvention, we claimt A driving gear having convolute gear threads on aface thereof, a pinion in mesh therewith and driven therefrom, and meansfor shifting said pinion relative to the axis of the driving gear,whereby the direction of rotation 4of the pinion is reversed.

In testimony whereof we affix our signatures, in presence of twowitnesses.

GEORGE F. DEADY. GEORGE H. HOLLAND.

Witnesses: y

R. J. MGOARTY, MATTHEW SIEBLER.

